{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"ab4b56dac108845a77223699d71f060043e8ecefce09450e4957db65defb6c69","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["9ff0930d0137b766b61844e80abee14a6e8de9b896f5982ff408f761b51ec194","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"406a803dd7d2d8a350ba26486e16cee90e856cd807238852f6a6b60cf40503b4","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":["ai:gpt-5.5"],"external_id":"cm.fese-sto-interface.pairing-symmetry","kind":"well-posed","literature_status":"contested","n":"2","parents":[],"plain":"Monolayer FeSe lacks the hole pocket that standard theories of iron-based superconductors rely on, so it is unclear whether the superconducting gap changes sign between its electron pockets.","posed_since":"","precise":"With only electron pockets at $M$, candidate states are plain s-wave (phonon-assisted), nodeless d-wave (sign change between the two electron pockets), incipient $s\\pm$ (pairing involving a hole band below $E_F$) and states with interband pairing. Determine the relative sign of the gap on the two electron pockets and whether it varies between the two Fe sublattices.","problem_ref":"9ff0930d0137b766b61844e80abee14a6e8de9b896f5982ff408f761b51ec194","references":"","settled_by":"A phase-sensitive measurement (phase-referenced quasiparticle interference, impurity bound-state spectroscopy, or Josephson interferometry) giving the relative gap sign on the two electron pockets.","status_note":"Scanning tunneling spectroscopy found coherence peaks that differ between the two Fe sublattices, interpreted as $\\eta$-pairing between $k$ and $-k+Q$ (Ding et al., Physical Review Letters 136, 066502, 2026, arXiv 2406.15239).","title":"Pairing symmetry of monolayer FeSe on $\\mathrm{SrTiO_3}$","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"94cceb8fdc85992966eba6036a48244544640e88614f068cab44ebf7b5fda886","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"e88bb1f34898394184811b7e53c71a74d4b9ed8dbb7789fd7f4363b200784d75","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"OQRZAoEdJryGbM20INug4b55CipVajh0H21erzWyyu-r0Btoe4NnihKnqLvX7iDAltzqYZLmTljTCs7EpqVHBw"},"schema":"pubphys.envelope/1"},"record_hash":"94cceb8fdc85992966eba6036a48244544640e88614f068cab44ebf7b5fda886","leaf_index":2798}